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A variable is a letter that represents a number. An expression that contains at least one variable is called variable expression, also called algebraic expression. A variable expression has one or more terms. A term is a number, a variable, or a product of numbers and variables. For example,
3(x^2)y + 2xy + x - 7 is a variable expression, where you have 4 terms.
When working with variable expression, you often use the substitution principle:
If a = b, then a may be replaced by b in any expression.
The set of numbers that a variable may be represent is called replacement set, or domain, of the variable. To evaluate a variable expression, you replace each variable with one of its values and simplify the numerical expression that results.
Example: Evaluate the expression 2x - 4y for x = 5 and y = -9.
Solution:
2x - 4y
= 2(5) - 4(-9)
= 10 + 36
=46
What else can I help you with?
What do you call replacing a variable in an in a algebraic expression with a quantiy?
When you replace a variable with a quantity, it is called a substitution.
How do you evaluate an algebraic expression?
You have to substitute a value for the letter variable in the expression. This is what we call evaluating the algebraic expression. An example would be 3x+1=7, when x=2.
What do you call a number in front of a variable?
Like the 7 in the expression 7x? If so that is called the coefficient.
What do you call a letter that stands for a number in an equation?
It is called a variable
What is twice a number plus 27 in an algebraic expression?
Twice a number can be represented as 2x, where x is the unknown number. Adding 27 to this expression gives 2x + 27. Therefore, "twice a number plus 27" can be written as the algebraic expression 2x + 27.
What do you call replacing a variable in an expression by a number and simplifying the result?
That is called 'solving'.
What do you call replacing a variable in an algebriac expression with a quantity?
substitution
What do you call replacing a variable in an algebraic expression with a quaintity?
I think it is called "replacing" or "substitution".
What do yo call replacing a variable in a algebraic expression with a quantity?
Substitution
What do you call replacing a variable in an in a algebraic expression with a quantiy?
When you replace a variable with a quantity, it is called a substitution.
What do you call the number that are multiplied by the variable in an algebraic expression?
factor
What is the algebraic expression for the product of 14 times a number?
Assuming you call your number "n", the expression would be "14n". You can replace "n" with whatever variable you want to use.
What do you call a number that stands alone in an equation?
You can call it a "number." To distinguish it from a variable expression, you can also call it a "constant."
What do you call a number variable or answer in an expression?
A number variable or answer in an expression is typically referred to as a "value." In mathematics, it can also be called a "numerical value" or "constant" if it doesn't change. When dealing with algebraic expressions, variables often represent unknown values and can take on different numerical values depending on the context.
What do you call a number that multiplies a variable?
A coefficient is a number that multiplies a variable.
What is a number that has no variable attached to it?
We call a number that has no variable attached to it, a constant. A number attached to a variable, as in 3x, is called a coefficient.
What do you call a set of numbers that can replace the variable in an algebraic expression?
A set of numbers that can replace the variable in an algebraic expression is called the "domain" of the expression. The domain consists of all possible input values (or variables) for which the expression is defined and yields valid outputs.
